<%# The license inside this block applies to this file.
        # Copyright 2018 Google Inc.
        # Licensed under the Apache License, Version 2.0 (the "License");
        # you may not use this file except in compliance with the License.
        # You may obtain a copy of the License at
        #
        #     http://www.apache.org/licenses/LICENSE-2.0
        #
        # Unless required by applicable law or agreed to in writing, software
        # distributed under the License is distributed on an "AS IS" BASIS,
        # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
        # See the License for the specific language governing permissions and
        # limitations under the License.
-%>
        // if rotationPeriod is changed, nextRotationTime must also be set.
	if d.HasChange("rotation_period") && d.Get("rotation_period") != "" {		
 		rotationPeriod := d.Get("rotation_period").(string)		
 		nextRotation, err := kmsCryptoKeyNextRotation(time.Now(), rotationPeriod)		

  		if err != nil {		
 			return nil, fmt.Errorf("Error setting CryptoKey rotation period: %s", err.Error())		
 		}		

                obj["nextRotationTime"] = nextRotation 
 	}

        return obj, nil
